BB149,135

Introduction

Variable capacitance diodes, which are also more commonly known as varicaps, varactors, or junction diodes, are a type of semiconductor device which vary their capacitance values depending on a external voltage. This type of diode has a wide range of applications, and the work as a reliable and efficient means of altering the capacitance of a circuit. In this article, we\'ll take a look at the BB149,135 diode and the application field and working principle of the device.

What is the BB149,135 Variable Capacitance Diode?

The BB149,135 is a device that belongs to the family of diode manufactured by STMicroelectronics, and is a variable capacitance diode. It is designed to be used in general-purpose variable capacitor applications. With minimum capacitance at reverse bias and maximum capacitance at forward bias, these variable capacitance diodes are capable of providing a capacitance range of 10 – 340 pF, making them ideal for use in wide-range band selection requirements.

Application Field & Working Principle

The BB149,135 variable capacitance diode can be used in a wide range of applications in both digital and analog circuits. Examples include local oscillator tuning in radio receivers, IF band selection in TV receivers, linear-VCO tuning in wireless communication, frequency-control oscillators, tuning of filters in audio circuits, and more.

The working principle of the device is based on the principle that the capacitance of a diode increases with forward bias and decreases with reverse bias. This property is used to alter the capacitance of the device by changing the bias voltage applied. With a maximum operating voltage of 50V and a minimum operating voltage of -3V, the BB149,135 can be used to tune the capacitance of the device over a sufficiently wide range.

Conclusion

The BB149,135 variable capacitance diode is a highly useful device, which finds its application in a wide range of circuits, from radio receivers to audio amplifiers. It functions by altering the capacitance of the device, depending on the external voltage applied, and can provide values from 10 – 340 pF. This makes it a great choice for wide-range band selection applications, frequency control oscillators, and more.